Quote Originally Posted by phil_trick
Looks like on J5 you have 2 serial ports coming out on that header.
WARNING: they look like they at TTL levels so they can't be plugged in to a serail port on a PC directly.
The is a 3.3v supply and ground so a level converter PCB could be made for that jumper, and the power could be drawn from the main PCB.
See my web pages at http://www.rwhitby.net/wrt54gs/serial.html and http://www.rwhitby.net/nslu2/serial.html for details of how to build level converters for these types on interfaces. Those pages include details of ready-made kits that you can buy, so the only thing you will need to do is wire up some connectors to J5.

The second set of headers: J1 (I think, hey, I can't count either ) look to be standard USB port headers. The only thing is that they do not have a +5v supply for the usb connectors. For that we might be able to draw the voltage from the +5v supply on the built in USB ports.
The other interesting thing is the three GPIO signals on that header. Wonder if they are used for anything on-board, or whether they are really three general purpose I/Os for our use :-)

-- Rod